Jonathan Klein, MD MSc

Maimonides Physician


Radiation Oncology


English, Hebrew, Spanish

About Me

Jonathan Klein is a radiation oncologist at Maimonides Medical Center. He is board-certified in Radiation Oncology in both the United States and Canada. Dr. Klein specializes in using radiation therapy to treat breast cancer, skin cancer, and lymphoma and hematologic malignancies, as well as palliative and stereotactic techniques for all cancer types. Dr. Klein's research interests focus on predicting cancer response to treatment, the effects of the costs of cancer care on patients and outcomes, and how patients use the internet to meet their medical needs. Dr. Klein is also deeply involved with resident and medical student education and welcomes learners from any specialty who are interested in how radiation therapy can help cancer patients. Prior to joining Maimonides, Dr. Klein spent five years working at Montefiore Medical Center in Bronx, New York. He is proud to provide compassionate, evidence-based care to the Brooklyn and broader New York communities.

Areas of Expertise

  • Breast cancer
  • Skin cancer
  • Lymphoma
  • Hematologic cancers
  • Stereotactic radiation
  • Palliative radiation
  • Response prediction to cancer treatment

Conditions Treated

  • Breast Cancer
  • Lymphoma
  • Hematologic Cancers
  • Skin Cancer


  • Radiation Therapy
  • 3D Radiation Therapy
  • Intensity Modulated Radiation Therapy
  • Stereotactic Body Radiation Therapy (SBRT)
  • Stereotactic Ablative Body Radiation Therapy (SABR)
  • Palliative Radiation Therapy


Medical Degree

University of Western Ontario


University of Toronto


University of Toronto; Princess Margaret Cancer Centre


University of Toronto; Sunnybrook Health Sciences Centre


Diplomate, American Board of Radiology (DABR); Fellow, Royal College of Physicians and Surgeons of Canada (FRCPC)


  • Aetna
  • Affinity Health Plan
  • CenterLight
  • Centers Plan
  • Centivo
  • Cigna
  • ElderPlan
  • EmblemHealth
  • Empire Blue Cross Blue Shield
  • Empire Plan (United Healthcare)
  • Fidelis
  • Hamaspik
  • HealthFirst
  • Hotel Trades
  • Local 1199
  • MagnaCare
  • Medicaid
  • Medicare
  • MetroPlus
  • MultiPlan
  • Oxford
  • RiverSpring Health Plans
  • Tricare
  • United Healthcare
  • VillageCare Max
  • VNS Choice
  • Wellcare
  • WTC Health Program

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